Artificial tooth.



e. E. FRITZ.

ARTIFICIAL TOOTH. APPLICATION FILED JUNE 15, I9I2.

1, 1 36,664. Patented Apr. 20, 1915.

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eusrav n. FRITZ, or PEORIA, ILLINOIS.

ARTIFICIAL TOOTH.

. To all whom z'tmay concern v Be itknown that I, GUs'rAV E. FRITZ, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented certain new and useful Improvements in Artificial Teeth, of

which the following is a specification.

This inventionhas reference to certain new and useful improvements in artificial teeth.

My invention is clearly illustrated in the accompanying drawings. 4inch, with the characters of reference marked thereon form a part of this specification, and in which: p

Figure 1 is an enlarged sectional view of a I bicuspid embodying my invention; the backing and pinshown in dotted lines applied to the tooth; Fig. 2 is a view of the bicuspid seen in Fig. 1' looking at one of itsapproXimal-faces, the backing and pin removed; Fig. 3 is a cross-section in plan as the same wouldappear if taken on the line 3-3 of Fig. 2 and with the backing applied to the tooth; Fig. 4 is a cross-section as the same would appear if taken on the line a-a of Fig. 1;' Fig. 5 is a cross-see tion as the same would appear if taken on the line bb of Fig. -1; Fig. 6 is a perspective view of the backing and-pin for a bi cuspid, such as shown in Fig. 2; Fig. 7 is a perspective view of a boxing or lining such as would be usedto linethe walls of an opening, groove or cavity in the tooth shown in Fig. 1. 1

The tooth 1 has the buccal surface 2, the lingual surface 3, the gingival margin 4, the buccal cusp 5 and the lingual cusp 6.

7 indicates what is known as the rubber-line-shoulder. The rubber-line-shou-lder and the lingual surface 3 proper, are divided by a depression. 8 which is formed by beveling ortapering the lingual surface 3 and 9 from the rubber-line shoulder 7 downwardly and'forwardly in the direction of the buccal surface and at a predetermined point such surface is beveled or tapered downwardly and rearwardly, as at 10, to the lingual surface proper. The lingual surface 3, proper, from the point "where the beveled surface 10 and the lingual 'than its lower wall.

Serial No. 703,849.

proximately vertically but at a slight angle and said lingual surface continues and merges into the gingival margin 4, from which, the buccal surface 2 extends outwardly and upwardly into the buccal cusp 5. The lingual surface 3, although beveled or inclined forwardly and downwardly, as shown in'Fig. 1, presents a flat surface transversely of the tooth, as shown in Fig. 3. The tooth also has an opening, groove or cavity 12, and said opening, groove or cavity 12.is lined with a metallic boxing or lining 13, preferably open at both ends. The opening, groove or cavity 1; is much larger in cross-section where the same opens out of the lingual surface 3, than at its inner end, and said opening, groove or cavity tapers gradually from the lingual surface to its inner terminus. The groove, opening or cavity 12 is curved, its upper wall being preferably struck on a radius which is shorter than the radius on which the lower wall is struck. In this way the tapering depth of the opening. groove-or cavity from end to end is determined. The groove, opening or cavity 12 opens out of the lingual surface 3, as was stated, and terminates in the buccal cusp 5. I prefer that the groove, opening or cavity 12, shall be wedge-shaped in-cross-section, see a section of the pin in Figs. 4 and 5,, and that the upper wall thereof shall be wider, or of greater width \Vith this construc;

tion and with the boxing or lining 13 in place, when the pin is applied, I have strength, where strength is needed. I also prefer that the lower wall of the lining or boxing 13 at the lingual surface 3 shall be contiguous to the point 11 where the angle of the lingual surfacefi changes. In other words, the opening 12 into the tooth is in the inclined portion of the lingual surface 3 The boxing or lining 13, as will be understood, conforms to the walls of the opening 12. v

The approxiinal surfaces 14 of the tooth 1 arebeveled or formed with the depressions 15. The upper walls 16 of these depressions, which in reality are shoulders. lead from and ,merge into the depression 8 in the lingual surface 3.of the tooth and extend forwardly and downwardly at a slight incline toward the'buccal surface and at 17 said V Jiierge, see also Fig. 3.

' walls or shoulders 16 turn and lead downwardly and rearwardly as at 18 toward the lingual surface, merging into the same atthe point 11. The depressions. although flat, see F g. 3, are-inclined or beveled, con,- verging' from the shoulders 17 and 18 to- Ward the lingual surface,

' '19 designates a pin, or backing securing member, which preferably conforms to and has; the same contour and outline as the openingt l2 and lining or boxin 13 in the tooth, and said pin has the enlarged and flaredhead 20. r

i 21desi'gnates "a backing of metal other suitable material. Said backing has the or-.

tion 22 adapted to rest against and conorm to the lingual surface 3,:with the lower beveled portion 23 adapted to lie against the lingual Surface 3 between the point 11 on the linguahsurface, and the gingivaL'margin l. The upper part .of the backing 21 has the portion 271 which inclines forwardly and upwardly, see Fig. 1, adapted to fitvthe in- 25 clinedsurface-IO, of the depression 8 in the lingual surface and with theupper flat edge 25 of'the backing 'abutting with the inclined surfadet) of the depression ,8 in the lingual surface. When'the backing is in place, see

the dotted lines Fig. 1, the lingual cusp and the face of the portion 24 of the backing, at th rubber-line-shoulder, are flush and form a continuation, oneof the other.

' The backing 21 has an opening 26.which is large enough for the pin 19 to be passed therethrough, but sufliciently small to prevent' the head 20 passingthrough. The walls of the opening 26 are/flared toiconform to and. form a seatlior the: head 20- of thepin 29. The backin 21 is'further 1 4 provided with the side walls 7. Said walls are adapted to the depressions 15 in the ap j proximal faces of the tooth. The edges 28 moving forward on the pin or the separation of the tooth at the lingual cusp from .the

backing, and the walls 27 of the backing seated in the depressions 15 of the tooth adds additional strength to the tooth andalso allows greater bulk of solder between into which they carried out and applied with out of the lingual surface in thebuccal cu'sp'; a curved pin and a backteeth, especially when several teeth are assembled. 4

The opening, groove or cavity 12 may be of any suitable shape, in cross-section, either round, square, wedge-shaped, dove-tailed or triangular and the pin of course is of similar formation. The essentialfeatures being that the opening and pin are curved, leading in from the lingual surface and terminating in the buccal cusp. p

- While I have illustrated my improvements in connection with only a bicuspid, it is to be understood that the invention may be equally as good results on the various teeth, especially is this true of the curved groove, openin or cavity in the tooth which may be applied to porcelain 'bite teeth having'a rubber'line, as well as to the anterior facings What I claim is a rubber-line-shoulder, a sloping lingual surface,

jacent the shoulder having a depression produced by oppositely in'clined faces; said,

tooth also having a curved cavity opening and terminating ing, said backing having a portion to fit against the lingual surface proper and also provided with a portion adapted to be seats ,1." Ato'oth formed with a buccal cusp and and also. having said surface ad-' ed in the depression in the lingual surface,

when the-pin is in the cavity of the tooth. 2. A tooth having a cavity which is curved longitudinally and wedge shaped in cross,- section and opening out of thev lingual sur-.,

face thereof; a backing for the tooth having an opening; a pin for securing the tooth and backing together, said pin curved throughout its length and wedge shaped in cross section. and having ahead adapted to be seated in the opening in the backing.

3. A tooth having a "rubber-line-shoulder and a sloping lingual surface, said surface adjacent the rubber-line-shoulder having a depression produced by oppositely inclined faces; the approximal wall of the tooth formed with .depressions, one wall of the depressions merging into the deepest portion of the depression in the lingual surgface and another wall of said depression merging. into the lingual surface at a predetermined point between the gingival margin and said depression in the lingual surface.

In testimony whereof I atiix my signature, in presence of two witnesses. GUSTAV E. FRITZ. I Witnesses: i 1 GEORGE T. BEAN,

BOMAN. I 

